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A virtual synchronous generator control method and device for a photovoltaic-energy storage system

A generator control and virtual synchronization technology, applied in photovoltaic power generation, circuit devices, electrical components, etc., can solve the problems of inability to support active power grids, poor primary frequency modulation effect of photovoltaic photovoltaic inverters, etc., to achieve primary frequency modulation, realize active power Support and improve the effect of running stability

Active Publication Date: 2019-03-05
XIAN XJ POWER ELECTRONICS TECH +4
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Problems solved by technology

[0004] The purpose of the present invention is to provide a virtual synchronous generator control method and device for a photovoltaic-energy storage system, which is used to solve the problem that the traditional photovoltaic photovoltaic inverter has a poor primary frequency modulation effect and cannot provide sufficient active support for the power grid

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  • A virtual synchronous generator control method and device for a photovoltaic-energy storage system
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  • A virtual synchronous generator control method and device for a photovoltaic-energy storage system

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Embodiment Construction

[0040] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0041] An embodiment of a virtual synchronous generator control method for a photovoltaic-energy storage system of the present invention:

[0042] The method is based on the figure 1 The virtual synchronous machine control method of the photovoltaic grid-connected system is shown. The photovoltaic grid-connected system includes photovoltaic panels, DC converters and photovoltaic inverters. One end of the DC converter is connected to the DC bus, and the other end is connected to the energy storage element. The DC bus is connected to The DC side of the photovoltaic inverter and the AC side of the photovoltaic inverter are connected to the power grid after being connected to a transformer.

[0043] Frequency f of collecting grid voltage g , when the frequency is less than the grid rated frequency f, the photovoltaic inverter operates in MPPT ...

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Abstract

The invention relates to a method and a device for controlling the virtual synchronous generator of a photovoltaic-energy storage system. By adding a DC converter connected with an energy storage element to a photovoltaic bus of a traditional photovoltaic inverter, simulation of the moment of inertia of a synchronous generator is realized. When the grid frequency decreases, the DC converter transmits active power to the grid to support the grid frequency and simulates the synchronous generator to release stored kinetic energy. When the grid frequency increases, the DC converter absorbs active power to support the grid frequency and simulates the synchronous generator to store excess energy. Thus, the photovoltaic inverter has the external characteristic of the synchronous generator. Primary frequency modulation of active power is realized. The operation stability of the power system is improved. Enough active power is provided to support the grid.

Description

technical field [0001] The invention belongs to the technical field of distributed power generation, and in particular relates to a method and device for controlling a virtual synchronous generator of a photovoltaic-energy storage system. Background technique [0002] At present, distributed power generation has been more and more applied in the power system because of its environmental friendliness and economical operation. Most distributed energy sources are connected to the grid through photovoltaic inverters. Photovoltaic inverters have fast response, Flexible control and other characteristics, but there are also problems such as lack of inertia and damping; coupled with the volatility and randomness of distributed energy, the access of a large number of photovoltaic inverters has brought challenges to the stable operation of the power grid. [0003] Virtual synchronous generator is a technology that uses photovoltaic inverters to simulate the characteristics of synchron...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/40H02J3/32
CPCH02J3/32H02J3/385H02J3/40Y02E10/56Y02E70/30
Inventor 黎阳张海龙王林黄辉肖飞曹建博白金刚焦照旭朱斯史学伟刘汉民王杨
Owner XIAN XJ POWER ELECTRONICS TECH
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